Linearization of an Outphasing Amplifier for Wide-band Multi-carrier Signals

Finnerty, Keith; Wesson, Robin; Dooley, John F.; Acar, Mustafa; Heijden, Mark P. van der; Farrell, Alison

doi:10.1109/lmwc.2014.2382653

Cited by 3 publications

(3 citation statements)

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“…They describe the model as AM distortion model based upon parallel Hammerstein function. The model is presented in (6) and (7). In this model, a function uses the outphased signals s i (n) and the input signal magnitude ||s(n)|| to the outphasing paths.…”

Section: A Existing Behavioral Modelsmentioning

confidence: 99%

“…In the Chireix combiner, these effects are relatively larger at lower output powers. In [7], a vector switch Volterra approach is used to linearize the NXP digital outphasing PA. This paper will extend on the work in [7], with more in-depth analysis of each model and enable a comparison with algorithms, which do not lend themselves to amplifier linearization.…”

Section: Introductionmentioning

confidence: 99%

“…In [7], a vector switch Volterra approach is used to linearize the NXP digital outphasing PA. This paper will extend on the work in [7], with more in-depth analysis of each model and enable a comparison with algorithms, which do not lend themselves to amplifier linearization. The models are evaluated with respect to characterization performance and computational complexity with the aim of identifying the optimum behavioral model for full system-level simulation.…”

Section: Introductionmentioning

confidence: 99%

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Behavioral Modeling of Outphasing Amplification Systems

Finnerty

Dooley

Wesson

et al. 2016

IEEE Trans. Microwave Theory Techn.

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This paper presents a comparison of existing and novel behavioral models targeted at the outphasing power amplifier (PA) architecture. A comprehensive comparison of ten modeling strategies is presented in the results. Novel techniques for outphasing PAs, such as vector switched and dual path time series, are also presented for the first time. Investigation of such techniques was driven by the analysis of outphasing operation at minimum output powers, demonstrating the generation of frequency-dependent amplitude and phase deviations, which can be difficult to characterize. The increased robustness was achieved at the cost of additional complexity; for practical implementation, time series coefficient reduction techniques were also evaluated. The results of all modeling approaches are experimentally validated for the wideband operation of an NXP 19-W GaN digital outphasing amplifier module. Considering computational complexity and accuracy for system-level modeling across all presented options, a subset of existing and new models is identified as best suited for modeling outphasing PAs.Index Terms-Behavioral model, outphasing, radio frequency (RF) power amplifier (PA), Volterra.

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Section: A Existing Behavioral Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%